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Deskripsyon:
Sa a se yon kontra enfòmèl ant twa tranzistò, rejenerasyon reseptè ak fidbak fiks yo. Se menm jan nan prensip nan radyo IC an ZN414 ki se kounye a ranplase pa MK484 la. konsepsyon la se senp ak sansiblite ak selectif nan reseptè a yo se bon.
nòt:
Tout objektif jeneral tranzistò ta dwe travay nan sa a sikwi, mwen itilize twa BC549 tranzistò nan pwototip m 'yo. se kous la branche fèt pou vag mwayen, men kous la ap travay jiska pi wo frekans si yo yon bobin akor diferan ak CAPACITOR itilize. Mwen itilize yon baton ferit ak condensateur akor soti nan yon radyo fin vye granmoun ki branche soti nan apeprè 550 - 1600kHz. Q1 ak Q2 fòme yon pè Compund transistor prezante segondè benefis ak trè wo enpedans opinyon. Sa a se nesesè se konsa yo pa initilman chaje kous la tank la. Q1 opere nan emeteur disip, Q2 komen emeteur, oto estabilize patipri se via rezisteur a 120k ak bobin an akor.
Rezistans nan 120k bay fidbak rejeneratif, ant pwodiksyon Q2 ak opinyon an sikwi tank ak valè li afekte pèfòmans an jeneral nan sikwi an antye. Twòp fidbak ak kous la ap vin enstab pwodwi yon "son urleman". Feedback ensifizan ak reseptè a vin "soud". Si sikwi a osil, Lè sa a, valè R1 a ka diminye; eseye 68k. Si gen yon mank de sansiblite, Lè sa a, eseye ogmante R1 alantou 150k. R1 ta ka ranplase tou pa yon rezisor fiks di 33k ak yon rezistans prereglaj nan 100k. Sa a pral bay ajisteman nan sansiblite ak selektivite nan reseptè a.
Transistor Q3 gen yon objektif doub; li fè demodulasyon nan konpayi asirans lan RF tou an menm tan an, anplifikasyon siyal la odyo. nivo Audio varye sou fòs la nan estasyon an te resevwa men mwen te gen tipikman 10-40 mv. Sa a pral dirèkteman kondwi kas ekoutè segondè enpedans oswa yo ka manje nan yon anplifikatè ki apwopriye.
Konstriksyon:
Tout koneksyon yo ta dwe kout, yon veroboard oswa layout tagstrip yo apwopriye. Kondansatè a akor gen plak fiks ak deplase. Plak k ap deplase yo ta dwe konekte nan fen "frèt" nan kous la tank, sa a se baz la nan Q1, ak plak yo fiks nan "fen a cho" nan bobin la, juction la nan R1 ak C1. Si koneksyon sou kondansateur la ranvèse, Lè sa a, deplase men ou tou pre kondansateur la ap lakòz estabilite vle ak osilasyon.
Finalman isit la gen kèk chèk vòltaj soti nan prototype.This breadboard mwen ta dwe ede nan pou detèmine si yon kous k ap travay: -
Tout mezi ki fèt ak yon batri 9volt fre ak twa tranzistò BC109C ki gen rapò ak batri tèminal la negatif.
Q1 (b) 1.31V
Q2 (b) 0.71V
Q2 (c) 1.34V
Q3 (b) 0.62V
Q3 (c) 3.87V
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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Antre nan imèl yo ka resevwa yon sipriz
es.fmuser.org
it.fmuser.org
fr.fmuser.org
de.fmuser.org
af.fmuser.org -> Afriken
sq.fmuser.org -> Albanyen
ar.fmuser.org -> Arab
hy.fmuser.org -> Armenian
az.fmuser.org -> Azerbaydjan
eu.fmuser.org -> Basque
be.fmuser.org -> Belarisyen
bg.fmuser.org -> Bulgarian
ca.fmuser.org -> Katalan
zh-CN.fmuser.org -> Chinwa (senplifye)
zh-TW.fmuser.org -> Chinwa (Tradisyonèl)
hr.fmuser.org -> Kwoasyen
cs.fmuser.org -> Czech
da.fmuser.org -> Danwa
nl.fmuser.org -> Olandè
et.fmuser.org -> Estonyen
tl.fmuser.org -> Filipino
fi.fmuser.org -> Finnish
fr.fmuser.org -> Franse
gl.fmuser.org -> Galisyen
ka.fmuser.org -> Georgian
de.fmuser.org -> Alman
el.fmuser.org -> Greek
ht.fmuser.org -> Kreyòl ayisyen
iw.fmuser.org -> ebre
hi.fmuser.org -> Hindi
hu.fmuser.org -> Hungarian
is.fmuser.org -> Icelandic
id.fmuser.org -> Endonezyen
ga.fmuser.org -> Ilandè
it.fmuser.org -> Italyen
ja.fmuser.org -> Japonè
ko.fmuser.org -> Koreyen
lv.fmuser.org -> Latvian
lt.fmuser.org -> Lithuanian
mk.fmuser.org -> Masedwan
ms.fmuser.org -> Malay
mt.fmuser.org -> Maltese
no.fmuser.org -> Norwegian
fa.fmuser.org -> Pèsik
pl.fmuser.org -> Polonè
pt.fmuser.org -> Pòtigè
ro.fmuser.org -> Romanian
ru.fmuser.org -> Ris
sr.fmuser.org -> Sèb
sk.fmuser.org -> Slovak
sl.fmuser.org -> Slovenian
es.fmuser.org -> Panyòl
sw.fmuser.org -> Swahili
sv.fmuser.org -> Syèd
th.fmuser.org -> Thai
tr.fmuser.org -> Tik
uk.fmuser.org -> Ikrenyen
ur.fmuser.org -> Oudou
vi.fmuser.org -> Vietnamese
cy.fmuser.org -> Welsh
yi.fmuser.org -> Yiddish
FMUSER Wirless Transmèt videyo ak odyo pi fasil!
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